/// <summary>
        /// 申请友链
        /// </summary>
        /// <param name="link"></param>
        /// <param name="cancellationToken"></param>
        /// <returns></returns>
        public async Task <ActionResult> Apply(Links link, CancellationToken cancellationToken)
        {
            if (!link.Url.MatchUrl() || link.Url.Contains(Request.Host.Host))
            {
                return(ResultData(null, false, "添加失败!链接非法!"));
            }

            if (link.Url.Contains(new[] { "?", "&", "=" }))
            {
                return(ResultData(null, false, "添加失败!请移除链接中的查询字符串后再试!如遇特殊情况,请联系站长进行处理。"));
            }

            if (!link.Url.Contains(link.UrlBase))
            {
                return(ResultData(null, false, "站点主页和友链地址不匹配,请检查"));
            }

            var host = new Uri(link.Url).Host;

            if (LinksService.Any(l => l.Url.Contains(host)))
            {
                return(ResultData(null, false, "添加失败!检测到您的网站已经是本站的友情链接了!"));
            }

            HttpClient.DefaultRequestHeaders.UserAgent.TryParseAdd("Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.4577.63 Safari/537.36 Edg/93.0.961.47");
            HttpClient.DefaultRequestHeaders.Referrer = new Uri(Request.Scheme + "://" + Request.Host);
            HttpClient.DefaultRequestHeaders.Add("X-Forwarded-For", "1.1.1.1");
            HttpClient.DefaultRequestHeaders.Add("X-Forwarded-Host", "1.1.1.1");
            HttpClient.DefaultRequestHeaders.Add("X-Real-IP", "1.1.1.1");
            HttpClient.DefaultRequestVersion = new Version(2, 0);
            return(await HttpClient.GetAsync(link.Url, cancellationToken).ContinueWith(t =>
            {
                if (t.IsFaulted || t.IsCanceled)
                {
                    return ResultData(null, false, "添加失败!检测到您的网站疑似挂了,或者连接到你网站的时候超时,请检查下!");
                }

                var res = t.Result;
                if (!res.IsSuccessStatusCode)
                {
                    return ResultData(null, false, "添加失败!检测到您的网站疑似挂了!返回状态码为:" + res.StatusCode);
                }

                using var httpContent = res.Content;
                var s = httpContent.ReadAsStringAsync().Result;
                if (!s.Contains(Request.Host.Host))
                {
                    return ResultData(null, false, $"添加失败!检测到您的网站上未将本站设置成友情链接,请先将本站主域名:{Request.Host}在您的网站设置为友情链接,并且能够展示后,再次尝试添加即可!");
                }

                var b = LinksService.AddEntitySaved(link) != null;
                return ResultData(null, b, b ? "添加成功!这可能有一定的延迟,如果没有看到您的链接,请稍等几分钟后刷新页面即可,如有疑问,请联系站长。" : "添加失败!这可能是由于网站服务器内部发生了错误,如有疑问,请联系站长。");
            }));
        }
        /// <summary>
        /// 申请友链
        /// </summary>
        /// <param name="links"></param>
        /// <returns></returns>
        public async Task <ActionResult> Apply(Links links)
        {
            if (!links.Url.MatchUrl())
            {
                return(ResultData(null, false, "添加失败!链接非法!"));
            }

            var host = new Uri(links.Url).Host;

            if (LinksService.Any(l => l.Url.Contains(host)))
            {
                return(ResultData(null, false, "添加失败!检测到您的网站已经是本站的友情链接了!"));
            }

            HttpClient.DefaultRequestHeaders.UserAgent.Add(ProductInfoHeaderValue.Parse("Mozilla/5.0"));
            HttpClient.DefaultRequestHeaders.Referrer = new Uri(Request.Scheme + "://" + Request.Host.ToString());
            return(await await HttpClient.GetAsync(links.Url).ContinueWith(async t =>
            {
                if (t.IsFaulted || t.IsCanceled)
                {
                    return ResultData(null, false, "添加失败!检测到您的网站疑似挂了,或者连接到你网站的时候超时,请检查下!");
                }

                var res = await t;
                if (!res.IsSuccessStatusCode)
                {
                    return ResultData(null, false, "添加失败!检测到您的网站疑似挂了!返回状态码为:" + res.StatusCode);
                }

                var s = await res.Content.ReadAsStringAsync();
                if (!s.Contains(CommonHelper.SystemSettings["Domain"]))
                {
                    return ResultData(null, false, $"添加失败!检测到您的网站上未将本站设置成友情链接,请先将本站主域名:{CommonHelper.SystemSettings["Domain"]}在您的网站设置为友情链接,并且能够展示后,再次尝试添加即可!");
                }

                var entry = LinksService.Get(l => l.Url.Equals(links.Url));
                bool b;
                if (entry is null)
                {
                    b = LinksService.AddEntitySaved(links) != null;
                }
                else
                {
                    entry.Url = links.Url;
                    entry.Except = links.Except;
                    entry.Name = links.Name;
                    entry.Recommend = links.Recommend;
                    b = LinksService.SaveChanges() > 0;
                }

                return ResultData(null, b, b ? "添加成功!这可能有一定的延迟,如果没有看到您的链接,请稍等几分钟后刷新页面即可,如有疑问,请联系站长。" : "添加失败!这可能是由于网站服务器内部发生了错误,如有疑问,请联系站长。");
            }));
        }
        public ActionResult Add(Links links)
        {
            var  entry = LinksService.GetById(links.Id);
            bool b;

            if (entry is null)
            {
                b = LinksService.AddEntitySaved(links) != null;
            }
            else
            {
                entry.Url       = links.Url;
                entry.Except    = links.Except;
                entry.Name      = links.Name;
                entry.Recommend = links.Recommend;
                b = LinksService.SaveChanges() > 0;
            }

            return(b ? ResultData(null, message: "添加成功!") : ResultData(null, false, "添加失败!"));
        }